/*
 * librdkafka - Apache Kafka C library
 *
 * Copyright (c) 2012,2013 Magnus Edenhill
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met: 
 * 
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution. 
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _RDKAFKA_TOPIC_H_
#define _RDKAFKA_TOPIC_H_

#include "rdlist.h"

extern const char *rd_kafka_topic_state_names[];


/**
 * @struct Light-weight topic object which only contains the topic name.
 *
 * For use in outgoing APIs (like rd_kafka_message_t) when there is
 * no proper topic object available.
 *
 * @remark lrkt_magic[4] MUST be the first field and be set to "LRKT".
 */
struct rd_kafka_lwtopic_s {
        char  lrkt_magic[4];     /**< "LRKT" */
        rd_kafka_t *lrkt_rk;     /**< Pointer to the client instance. */
        rd_refcnt_t lrkt_refcnt; /**< Refcount */
        char *lrkt_topic;        /**< Points past this struct, allocated
                                  *   along with the struct. */
};

/** Casts a topic_t to a light-weight lwtopic_t */
#define rd_kafka_rkt_lw(rkt)                    \
        ((rd_kafka_lwtopic_t *)rkt)

#define rd_kafka_rkt_lw_const(rkt)              \
        ((const rd_kafka_lwtopic_t *)rkt)

/**
 * @returns true if the topic object is a light-weight topic, else false.
 */
static RD_UNUSED RD_INLINE
rd_bool_t rd_kafka_rkt_is_lw (const rd_kafka_topic_t *app_rkt) {
        const rd_kafka_lwtopic_t *lrkt = rd_kafka_rkt_lw_const(app_rkt);
        return !memcmp(lrkt->lrkt_magic, "LRKT", 4);
}

/** @returns the lwtopic_t if \p rkt is a light-weight topic, else NULL. */
static RD_UNUSED RD_INLINE
rd_kafka_lwtopic_t *rd_kafka_rkt_get_lw (rd_kafka_topic_t *rkt) {
        if (rd_kafka_rkt_is_lw(rkt))
                return rd_kafka_rkt_lw(rkt);
        return NULL;
}

void rd_kafka_lwtopic_destroy (rd_kafka_lwtopic_t *lrkt);
rd_kafka_lwtopic_t *rd_kafka_lwtopic_new (rd_kafka_t *rk, const char *topic);

static RD_UNUSED RD_INLINE
void rd_kafka_lwtopic_keep (rd_kafka_lwtopic_t *lrkt) {
        rd_refcnt_add(&lrkt->lrkt_refcnt);
}




/*
 * @struct Internal representation of a topic.
 *
 * @remark rkt_magic[4] MUST be the first field and be set to "IRKT".
 */
struct rd_kafka_topic_s {
        char  rkt_magic[4];  /**< "IRKT" */

	TAILQ_ENTRY(rd_kafka_topic_s) rkt_link;

	rd_refcnt_t        rkt_refcnt;

	rwlock_t           rkt_lock;
	rd_kafkap_str_t   *rkt_topic;

	rd_kafka_toppar_t  *rkt_ua;         /**< Unassigned partition (-1) */
	rd_kafka_toppar_t **rkt_p;          /**< Partition array */
	int32_t            rkt_partition_cnt;

        rd_list_t          rkt_desp;              /* Desired partitions
                                                   * that are not yet seen
                                                   * in the cluster. */
        rd_interval_t      rkt_desp_refresh_intvl; /**< Rate-limiter for
                                                    *   desired partition
                                                    *   metadata refresh. */

        rd_ts_t            rkt_ts_create;   /**< Topic object creation time. */
	rd_ts_t            rkt_ts_metadata; /* Timestamp of last metadata
					     * update for this topic. */

	rd_refcnt_t        rkt_app_refcnt;   /**< Number of active rkt's new()ed
                                              *   by application. */

	enum {
		RD_KAFKA_TOPIC_S_UNKNOWN,   /* No cluster information yet */
		RD_KAFKA_TOPIC_S_EXISTS,    /* Topic exists in cluster */
		RD_KAFKA_TOPIC_S_NOTEXISTS, /* Topic is not known in cluster */
	} rkt_state;

        int               rkt_flags;
#define RD_KAFKA_TOPIC_F_LEADER_UNAVAIL   0x1 /* Leader lost/unavailable
                                               * for at least one partition. */

	rd_kafka_t       *rkt_rk;

        rd_avg_t          rkt_avg_batchsize; /**< Average batch size */
        rd_avg_t          rkt_avg_batchcnt;  /**< Average batch message count */

	rd_kafka_topic_conf_t rkt_conf;
};

#define rd_kafka_topic_rdlock(rkt)     rwlock_rdlock(&(rkt)->rkt_lock)
#define rd_kafka_topic_wrlock(rkt)     rwlock_wrlock(&(rkt)->rkt_lock)
#define rd_kafka_topic_rdunlock(rkt)   rwlock_rdunlock(&(rkt)->rkt_lock)
#define rd_kafka_topic_wrunlock(rkt)   rwlock_wrunlock(&(rkt)->rkt_lock)



/**
 * @brief Increase refcount and return topic object.
 */
static RD_INLINE RD_UNUSED
rd_kafka_topic_t *rd_kafka_topic_keep (rd_kafka_topic_t *rkt) {
        rd_kafka_lwtopic_t *lrkt;
        if (unlikely((lrkt = rd_kafka_rkt_get_lw(rkt)) != NULL))
                rd_kafka_lwtopic_keep(lrkt);
        else
                rd_refcnt_add(&rkt->rkt_refcnt);
        return rkt;
}

void rd_kafka_topic_destroy_final (rd_kafka_topic_t *rkt);

rd_kafka_topic_t *rd_kafka_topic_proper (rd_kafka_topic_t *app_rkt);



/**
 * @brief Loose reference to topic object as increased by ..topic_keep().
 */
static RD_INLINE RD_UNUSED void
rd_kafka_topic_destroy0 (rd_kafka_topic_t *rkt) {
        rd_kafka_lwtopic_t *lrkt;
        if (unlikely((lrkt = rd_kafka_rkt_get_lw(rkt)) != NULL))
                rd_kafka_lwtopic_destroy(lrkt);
        else if (unlikely(rd_refcnt_sub(&rkt->rkt_refcnt) == 0))
                rd_kafka_topic_destroy_final(rkt);
}


rd_kafka_topic_t *rd_kafka_topic_new0 (rd_kafka_t *rk, const char *topic,
                                       rd_kafka_topic_conf_t *conf,
                                       int *existing, int do_lock);

rd_kafka_topic_t *rd_kafka_topic_find_fl (const char *func, int line,
                                          rd_kafka_t *rk,
                                          const char *topic,
                                          int do_lock);
rd_kafka_topic_t *rd_kafka_topic_find0_fl (const char *func, int line,
                                           rd_kafka_t *rk,
                                           const rd_kafkap_str_t *topic);
#define rd_kafka_topic_find(rk,topic,do_lock)                           \
        rd_kafka_topic_find_fl(__FUNCTION__,__LINE__,rk,topic,do_lock)
#define rd_kafka_topic_find0(rk,topic)                                  \
        rd_kafka_topic_find0_fl(__FUNCTION__,__LINE__,rk,topic)
int rd_kafka_topic_cmp_rkt (const void *_a, const void *_b);

void rd_kafka_topic_partitions_remove (rd_kafka_topic_t *rkt);

rd_bool_t rd_kafka_topic_set_notexists (rd_kafka_topic_t *rkt,
                                        rd_kafka_resp_err_t err);

int rd_kafka_topic_metadata_update2 (rd_kafka_broker_t *rkb,
                                     const struct rd_kafka_metadata_topic *mdt);

void rd_kafka_topic_scan_all (rd_kafka_t *rk, rd_ts_t now);


typedef struct rd_kafka_topic_info_s {
	const char *topic;          /**< Allocated along with struct */
	int   partition_cnt;
} rd_kafka_topic_info_t;


int rd_kafka_topic_info_cmp (const void *_a, const void *_b);
rd_kafka_topic_info_t *rd_kafka_topic_info_new (const char *topic,
						int partition_cnt);
void rd_kafka_topic_info_destroy (rd_kafka_topic_info_t *ti);

int rd_kafka_topic_match (rd_kafka_t *rk, const char *pattern,
			  const char *topic);

int rd_kafka_toppar_broker_update (rd_kafka_toppar_t *rktp,
                                   int32_t broker_id, rd_kafka_broker_t *rkb,
                                   const char *reason);

int rd_kafka_toppar_delegate_to_leader (rd_kafka_toppar_t *rktp);

rd_kafka_resp_err_t
rd_kafka_topics_leader_query_sync (rd_kafka_t *rk, int all_topics,
                                   const rd_list_t *topics, int timeout_ms);
void rd_kafka_topic_leader_query0 (rd_kafka_t *rk, rd_kafka_topic_t *rkt,
                                   int do_rk_lock);
#define rd_kafka_topic_leader_query(rk,rkt) \
        rd_kafka_topic_leader_query0(rk,rkt,1/*lock*/)

#define rd_kafka_topic_fast_leader_query(rk) \
        rd_kafka_metadata_fast_leader_query(rk)

void rd_kafka_local_topics_to_list (rd_kafka_t *rk, rd_list_t *topics);

void rd_ut_kafka_topic_set_topic_exists (rd_kafka_topic_t *rkt,
                                         int partition_cnt,
                                         int32_t leader_id);

#endif /* _RDKAFKA_TOPIC_H_ */
